LandOfFree - US Patents - Listing for Wells,Valves, closures or changeable restrictors,Fluid operated

Wells – Valves – closures or changeable restrictors – Fluid operated

Method and apparatus for catching a pump-down plug or ball

Wells – Valves – closures or changeable restrictors – Fluid operated

Method and apparatus for continuously injecting fluid in a...

Wells – Valves – closures or changeable restrictors – Fluid operated

Method and apparatus for controlling well pressure in...

Wells – Valves – closures or changeable restrictors – Fluid operated

Method and apparatus for selective injection or flow control...

Wells – Valves – closures or changeable restrictors – Fluid operated

Method and apparatus for selective injection or flow control...

Wells – Valves – closures or changeable restrictors – Fluid operated

Method of mixing fluids in a well bore

Wells – Valves – closures or changeable restrictors – Fluid operated

Mud check valves in drilling apparatus (wells)

Wells – Valves – closures or changeable restrictors – Fluid operated

Mudsaver valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Multi-cycle downhill apparatus

Wells – Valves – closures or changeable restrictors – Fluid operated

Multi-cycle single line switch

Wells – Valves – closures or changeable restrictors – Fluid operated

Multi-purpose pressure operated downhole valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Multi-stage sliding valve fluid operated and pressure balanced

Wells – Valves – closures or changeable restrictors – Fluid operated

Multicycle hydraulic control valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Multiple zone downhole intelligent flow control valve system...

Wells – Valves – closures or changeable restrictors – Fluid operated

Multiple zone downhole intelligent flow control valve system...

Wells – Valves – closures or changeable restrictors – Fluid operated

Oil-well flap-type safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Oil-well safety-valve and tool for installing the same

Wells – Valves – closures or changeable restrictors – Fluid operated

Open barrel cage

Wells – Valves – closures or changeable restrictors – Fluid operated

Open hole pipe recovery circulation valve